方法一：
后台代码：
复制代码 代码如下:
protected void btn_delete_Click(object sender, EventArgs e)
{
for (int i = 0; i <this.GridView1.Rows.Count; i++)
{
int id = Convert.ToInt32(this.GridView1.DataKeys[i].Value);
if ((this.GridView1.Rows[i].Cells[0].FindControl("CheckBox1") as CheckBox).Checked == true)
{
Delete(id);
ClientScript.RegisterStartupScript(GetType(),"提示","<script>alert('删除成功！')</script>");
}
}
this.GridView1.DataBind();
}//删除
private void Delete(int id)
{
using (SqlConnection conn = new SqlConnection(str))
{
conn.Open();
SqlCommand comm = conn.CreateCommand();
comm.CommandText = "delete from Notice_Msg where id=@id";
comm.Parameters.Add(new SqlParameter("@id", id));
comm.ExecuteNonQuery();
}
}

前台代码：
复制代码 代码如下:
<asp:GridView ID="GridView1" runat="server" DataKeyNames="id">

另外还得添加一列，让其绑定的字段为id，并且把这一列的visable属性设为false
方法二：
后台：
复制代码 代码如下:
protected void btn_delete_Click(object sender, EventArgs e)
{
foreach (GridViewRow row in this.GridView1.Rows)
{
if (row.RowType == DataControlRowType.DataRow)
{
CheckBox ckb = row.Cells[2].FindControl("CheckBox1") as CheckBox;
if (ckb.Checked)
{
using (SqlConnection sqlCnn = new SqlConnection(str))
{
using (SqlCommand sqlCmm = sqlCnn.CreateCommand())
{
sqlCmm.CommandText = "delete from Regime_Table where id='" + row.Cells[0].Text + "' ";
sqlCnn.Open();
int a= sqlCmm.ExecuteNonQuery();
if (a>0)
{
ClientScript.RegisterStartupScript(GetType(),"提示","<script>alert('删除成功！')</script>");
}
else
{
ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alert('删除失败！')</script>");
}
this.DataBind();
}
}
}
}
}
}

前台：
复制代码 代码如下:
<style type="text/css">
.Hidden
{
display:none;
}
</style>
<asp:BoundField DataField="id" HeaderText="编号" >
<HeaderStyle CssClass="Hidden" />
<ItemStyle CssClass="Hidden" />
</asp:BoundField>

新增加一列，这一列绑定id字段，并且visable属性不能为false,否则取不出值来。

checkbox全选功能：
复制代码 代码如下:
<script type="text/jscript">
function change(sender) {
var table = document.getElementById("GridView1");
for (var i = 1; i < table.rows.length; i++) {
table.rows[i].cells[1].getElementsByTagName("input")[0].checked = sender.checked;
}
}
</script>
<HeaderTemplate>
<input id="Checkbox2" type="checkbox" onclick="change(this)"/>
全选
</HeaderTemplate>